The city's interim chief financial officer, Dave Millican, told the City Council that two factors have driven up the initial estimate by $1.4 million: Creditors have challenged Stockton's eligibility to seek Chapter 9 protection, prolonging the case, and the bankruptcy judge has put the city and its creditors into another round of mediation, increasing the workload, he said.

The City Council approved the additional money to fund Stockton's bankruptcy on a 6-0 vote, with Councilman Dale Fritchen absent.

City leaders also approved paying Assured Guaranty, which owns the former Washington Mutual building at 400 E. Main St., an additional $400,000 in rent to maintain the city's information technology system there.

Stockton resident Gary Malloy told the council what worried him is that Assured Guaranty is one of the creditors causing Stockton's bankruptcy case to draw out longer than expected. Now the city is paying it more in rent.

"As a citizen, it's really frustrating," said Malloy, who said he agreed the city needed to seek bankruptcy protection.

By comparison, Vallejo's bankruptcy, which spanned three years, cost that city an estimated $12 million.

Mayor Ann Johnston said the city will continue to review budget changes as the year plays out.

"We will continue to revisit them," Johnston said. "Remember, this is all new territory for us."